xfs_admin: support label queries for mounted filesystems
Adapt this tool to call xfs_io if the block device in question is
mounted.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
diff --git a/db/xfs_admin.sh b/db/xfs_admin.sh
index 409975b..21c9d71 100755
--- a/db/xfs_admin.sh
+++ b/db/xfs_admin.sh
@@ -8,9 +8,34 @@
DB_OPTS=""
REPAIR_OPTS=""
REPAIR_DEV_OPTS=""
+IO_OPTS=""
LOG_OPTS=""
USAGE="Usage: xfs_admin [-efjlpuV] [-c 0|1] [-L label] [-O v5_feature] [-r rtdev] [-U uuid] device [logdev]"
+# Try to find a loop device associated with a file. We only want to return
+# one loopdev (multiple loop devices can attach to a single file) so we grab
+# the last line and return it if it's actually a block device.
+try_find_loop_dev_for_file() {
+ local x="$(losetup -O NAME -j "$1" 2> /dev/null | tail -n 1)"
+ test -b "$x" && echo "$x"
+}
+
+try_find_mount_point_for_bdev() {
+ local arg="$1"
+
+ # See if we can map the arg to a loop device
+ loopdev="$(try_find_loop_dev_for_file "${arg}")"
+ test -n "${loopdev}" && arg="${loopdev}"
+
+ if [ ! -b "${arg}" ]; then
+ return 1
+ fi
+
+ # If we find a mountpoint for the device, do a live query;
+ # otherwise try reading the fs with xfs_db.
+ findmnt -t xfs -f -n -o TARGET "${arg}" 2> /dev/null
+}
+
while getopts "c:efjlL:O:pr:uU:V" c
do
case $c in
@@ -18,8 +43,10 @@
e) DB_OPTS=$DB_OPTS" -c 'version extflg'";;
f) DB_OPTS=$DB_OPTS" -f";;
j) DB_OPTS=$DB_OPTS" -c 'version log2'";;
- l) DB_OPTS=$DB_OPTS" -r -c label";;
- L) DB_OPTS=$DB_OPTS" -c 'label "$OPTARG"'";;
+ l) DB_OPTS=$DB_OPTS" -r -c label";
+ IO_OPTS=$IO_OPTS" -r -c label";;
+ L) DB_OPTS=$DB_OPTS" -c 'label "$OPTARG"'";
+ IO_OPTS=$IO_OPTS" -c 'label -s "$OPTARG"'";;
O) REPAIR_OPTS=$REPAIR_OPTS" -c $OPTARG";;
p) DB_OPTS=$DB_OPTS" -c 'version projid32bit'";;
r) REPAIR_DEV_OPTS=" -r '$OPTARG'";;
@@ -43,6 +70,16 @@
LOG_OPTS=" -l '$2'"
fi
+ if [ -n "$IO_OPTS" ]; then
+ mntpt="$(try_find_mount_point_for_bdev "$1")"
+ if [ $? -eq 0 ]; then
+ eval xfs_io -x -p xfs_admin $IO_OPTS "$mntpt"
+ status=$?
+ DB_OPTS=""
+ REPAIR_OPTS=""
+ fi
+ fi
+
if [ -n "$DB_OPTS" ]
then
eval xfs_db -x -p xfs_admin $LOG_OPTS $DB_OPTS "$1"
